Toyota CH-R Service Manual: Terminals Of Ecu

Toyota CH-R Service Manual / Seat Belt / Seat Belt Warning System(w/o Occupant Classification System) / Terminals Of Ecu

TERMINALS OF ECU

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Main Body ECU (Multiplex Network Body ECU) with 1 Connector

Main Body ECU (Multiplex Network Body ECU) with 2 Connectors

(a) Disconnect the main body ECU (multiplex network body ECU) connectors.

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(b) Measure the resistance and voltage according to the value(s) in the table below.

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
MB-31 (BECU) - Body ground	-	Battery power supply	Always	11 to 14 V
MB-32 (IG) - Body ground	-	Ignition power supply (IG signal)	Ignition switch ON → off	11 to 14 V → Below 1 V
MB-30 (ACC) - Body ground	-	Ignition power supply (ACC signal)	Ignition switch ACC → off	11 to 14 V → Below 1 V
MB-11 (GND1) - Body ground	-	Ground	Always	Below 1 Ω
MB-18 (DBKL) - Body ground	-	Driver seat belt buckle switch signal	Driver seat belt fastened	10 kΩ or higher
MB-18 (DBKL) - Body ground	-	Driver seat belt buckle switch signal	Driver seat belt unfastened	Below 1 Ω
MB-2 (RCTY) - Body ground	-	Rear door courtesy light switch RH input	Rear door LH closed (OFF)	10 kΩ or higher
MB-2 (RCTY) - Body ground	-	Rear door courtesy light switch RH input	Rear door LH open (ON)	Below 1 Ω
MB-13 (LCTY) - Body ground	-	Rear door courtesy light switch LH input	Rear door RH closed (OFF)	10 kΩ or higher
MB-13 (LCTY) - Body ground	-	Rear door courtesy light switch LH input	Rear door RH open (ON)	Below 1 Ω

CHECK COMBINATION METER ASSEMBLY

(a) Disconnect the F4 combination meter assembly connector.

(b) Measure the resistance and voltage according to the value(s) in the table below.

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
F4-40 (B) - Body ground	SB - Body ground	Battery power supply	Always	11 to 14 V
F4-39 (IG+) - Body ground	P - Body ground	IG power supply	Ignition switch ON → off	11 to 14 V → Below 1 V
F4-21 (ET) - Body ground	W- B - Body ground	Ground	Always	Below 1 Ω
F4-7 (PKBI) - Body ground	GR - Body ground	Front passenger seat belt buckle switch signal	Ignition switch ON, front passenger side seat belt fastened and front passenger seat occupied	10 kΩ or higher
F4-7 (PKBI) - Body ground	GR - Body ground	Front passenger seat belt buckle switch signal	Ignition switch ON, front passenger side seat belt unfastened and front passenger seat occupied	Below 1 Ω

Data List / Active Test

DATA LIST / ACTIVE TEST DATA LIST NOTICE: In the following table, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when de ...

Driver Side Seat Belt Warning Light does not Operate

DESCRIPTION The combination meter assembly blinks or turns off the seat belt warning light on the combination meter assembly in accordance with the state of the front seat inner belt assembly (dr ...

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